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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f49bb758d5e34e4152fefaee8f79b1c8c688319f7c9577e54d47308613cdd315' 
  AND token = 'm8pO3HwnI9P8PrqKb93ydWf8IV7xBXvr2W31paVQTmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}